Since I consider tracking multiple mnemonics within a single entity a very insecure approach to interacting with cryptocurrencies, I wouldn't recommend anything besides importing several extended public keys into something like above application. You can also try something like https://github.com/bwt-dev/bwt because "it uses bitcoind to keep track of your wallet addresses (derived from your xpub(s)) and builds an index of their history that can be queried using the Electrum RPC protocol or using bwt's custom designed HTTP API." Also try https://vezgo.com/ but I don't know how reliable they are since I never used their API. But they claim that "building crypto wallet trackers has never been easier, thanks to Vezgo. Vezgo is an API provider that gives you just one API for all tracking all crypto wallets, including Trust Wallet, Ledger xPub, Trezor, and so many more." Please note that I found all these projects just by asking Google, which means I can't really recommend any of them. The only reason I consider them kinda safe is because they don't ask for private information, just your xpubs.